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Rack guards are a different kind of guard rail. These aren't built to control traffic, but designed instead to protect the row ends of racks.
If you have forklifts, bobcats or other traffic in the area, you'll want to have some additional protection from an accidental impact. A forklift that backs into the rack-type guard rail will probably cause some cosmetic damage to guard rail and/or machine, but the rack itself will most likely be unaffected.
It is not wise to use the rack guard to shore up an unstable rack or one that needs maintenance. In spite of sites you may encounter where the rail is practically flush with the rack, the guard rail is only meant to protect the equipment, not add structural support.